We can conclude from the passage that the scientific means for recycling solid waste________.

A．American people realize that all the wastes can be converted into useful resources
B．the main barrier for recycling is the lack of valuable new technological approaches
C．today only a little of the waste is diverted from municipal dump due to the high cost
D．it is much more cheaper to use recycled materials

A．departure of his wife
B．death of his wife
C．return of his wife
D．annoyance of his wife